<template>
	<view>
		<view class="uni-navbar" :class="{ 'uni-navbar-fixed': fixed }" :style="{ background: backgroundColor }">
			<view :class="{ 'uni-navbar--fixed': fixed, 'uni-navbar--shadow': shadow, 'uni-navbar--border': border }" class="uni-navbar__content">
				<status-bar v-if="statusBar" />
				<view class="uni-navbar__header uni-navbar__content_view">
					<view @tap="onClickLeft" class="uni-navbar__header-btns uni-navbar__header-btns-left uni-navbar__content_view">
						<view class="uni-navbar__content_view" v-if="leftIcon.length"><uni-icons :color="color" :type="leftIcon" size="18" /></view>
						<view :class="{ 'uni-navbar-btn-icon-left': !leftIcon.length }" class="uni-navbar-btn-text uni-navbar__content_view" v-if="leftText.length">
							<text :style="{ color: color, fontSize: '14px' }">{{ leftText }}</text>
						</view>
						<slot name="left" />
					</view>
					<view class="uni-navbar__header-container uni-navbar__content_view" @tap="onClickTitle">
						<view class="uni-navbar__header-container-inner uni-navbar__content_view" v-if="title.length">
							<text class="uni-nav-bar-text" :style="{ color: color }">{{ title }}</text>
						</view>
						<!-- 标题插槽 -->
						<slot />
					</view>
					<view :class="title.length ? 'uni-navbar__header-btns-right' : ''" @tap="onClickRight" class="uni-navbar__header-btns uni-navbar__content_view">
						<view class="uni-navbar__content_view" v-if="rightIcon.length"><uni-icons :color="color" :type="rightIcon" size="24" /></view>
						<!-- 优先显示图标 -->
						<view class="uni-navbar-btn-text uni-navbar__content_view" v-if="rightText.length && !rightIcon.length">
							<text class="uni-nav-bar-right-text" :style="{ color: color }">{{ rightText }}</text>
						</view>
						<slot name="right" />
					</view>
				</view>
			</view>
			<view class="uni-navbar__placeholder" v-if="fixed">
				<status-bar v-if="statusBar" />
				<view class="uni-navbar__placeholder-view" />
			</view>
		</view>
		<status-bar v-if="statusBar && fixed" />
		<view style="height: 44px;" v-if="fixed"></view>
	</view>
</template>

<script>
import statusBar from './uni-status-bar.vue';

/**
 * NavBar 自定义导航栏
 * @description 导航栏组件，主要用于头部导航
 * @tutorial https://ext.dcloud.net.cn/plugin?id=52
 * @property {String} title 标题文字
 * @property {String} leftText 左侧按钮文本
 * @property {String} rightText 右侧按钮文本
 * @property {String} leftIcon 左侧按钮图标（图标类型参考 [Icon 图标](http://ext.dcloud.net.cn/plugin?id=28) type 属性）
 * @property {String} rightIcon 右侧按钮图标（图标类型参考 [Icon 图标](http://ext.dcloud.net.cn/plugin?id=28) type 属性）
 * @property {String} color 图标和文字颜色
 * @property {String} backgroundColor 导航栏背景颜色
 * @property {Boolean} fixed = [true|false] 是否固定顶部
 * @property {Boolean} statusBar = [true|false] 是否包含状态栏
 * @property {Boolean} shadow = [true|false] 导航栏下是否有阴影
 * @event {Function} clickLeft 左侧按钮点击时触发
 * @event {Function} clickRight 右侧按钮点击时触发
 * @event {Function} clickTitle 中间标题点击时触发
 */
export default {
	name: 'UniNavBar',
	components: {
		statusBar
	},
	emits: ['clickLeft', 'clickRight', 'clickTitle'],
	props: {
		title: {
			type: String,
			default: ''
		},
		leftText: {
			type: String,
			default: ''
		},
		rightText: {
			type: String,
			default: ''
		},
		leftIcon: {
			type: String,
			default: ''
		},
		rightIcon: {
			type: String,
			default: ''
		},
		fixed: {
			type: [Boolean, String],
			default: false
		},
		color: {
			type: String,
			default: '#000000'
		},
		backgroundColor: {
			type: String,
			default: '#FFFFFF'
		},
		statusBar: {
			type: [Boolean, String],
			default: false
		},
		shadow: {
			type: [Boolean, String],
			default: false
		},
		border: {
			type: [Boolean, String],
			default: true
		}
	},
	mounted() {
		if (uni.report && this.title !== '') {
			uni.report('title', this.title);
		}
	},
	methods: {
		onClickLeft() {
			this.$emit('clickLeft');
		},
		onClickRight() {
			this.$emit('clickRight');
		},
		onClickTitle() {
			this.$emit('clickTitle');
		}
	}
};
</script>

<style lang="scss" scoped>
$nav-height: 44px;
.uni-navbar-fixed {
	position: fixed;
	width: 100%;
	top: 0;
	left: 0;
	z-index: 998;
}
.uni-nav-bar-text {
	/* #ifdef APP-PLUS */
	font-size: 34rpx;
	/* #endif */
	/* #ifndef APP-PLUS */
	font-size: $uni-font-size-lg;
	/* #endif */
}

.uni-nav-bar-right-text {
	font-size: 26rpx;
}

.uni-navbar__content {
	position: relative;
	// background-color: $uni-bg-color;
	overflow: hidden;
	// width: 750rpx;
}

.uni-navbar__content_view {
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	align-items: center;
	flex-direction: row;
	// background-color: #FFFFFF;
}

.uni-navbar__header {
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex-direction: row;
	height: $nav-height;
	line-height: $nav-height;
	font-size: 16px;
	// background-color: #ffffff;
}

.uni-navbar__header-btns {
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex-wrap: nowrap;
	// width: 120rpx;
	padding: 0 6px;
	justify-content: center;
	align-items: center;
	/* #ifdef H5 */
	cursor: pointer;
	/* #endif */
}

.uni-navbar__header-btns-left {
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	width: 150rpx;
	justify-content: flex-start;
}

.uni-navbar__header-btns-right {
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	width: 150rpx;
	padding-right: 30rpx;
	justify-content: flex-end;
}

.uni-navbar__header-container {
	flex: 1;
}

.uni-navbar__header-container-inner {
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex: 1;
	align-items: center;
	justify-content: center;
	font-size: $uni-font-size-base;
}

.uni-navbar__placeholder-view {
	height: $nav-height;
}

.uni-navbar--fixed {
	position: fixed;
	z-index: 998;
	/* #ifdef H5 */
	left: var(--window-left);
	right: var(--window-right);
	/* #endif */
	/* #ifndef H5 */
	left: 0;
	right: 0;
	/* #endif */
}

.uni-navbar--shadow {
	/* #ifndef APP-NVUE */
	box-shadow: 0 1px 6px #ccc;
	/* #endif */
}

.uni-navbar--border {
	border-bottom-width: 1rpx;
	border-bottom-style: solid;
	border-bottom-color: $uni-border-color;
}
</style>
